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→Use Cases: Fix bug link
* A top site has a bug that affects Firefox users that can be worked around by modifying navigator.userAgent:
** trailers.apple.com blocking Firefox users on OS X 10.11 and above, but videos work when sending a Chrome user agent. https://bugzilla.mozilla.org/show_bug.cgi?id={{bug|1262149}}
** YouTube stopped serving MSE/WebM to Firefox 43 users, due to a server side UA parsing bug. Worked around by hard coding 42 in UA string, for youtube.com (until they fixed): https://bugzilla.mozilla.org/show_bug.cgi?id={{bug|1233970}}
* Firefox ships a regression in release breaking top sites
* Hiding messages such as "Best seen in Chrome”, or unsupported browser banners or redirected pages in top sites. e.g., Bank of America on OSX, https://bugzilla.mozilla.org/show_bug.cgi?id={{bug|1280834}}
* Working around widely deployed libraries or frameworks that don't support Firefox, have bugs, or make bad assumptions about Gecko, e.g., BrightCove and Ooyola serving HLS over .m3u8 to Firefox for Android on Android 4 (which is not supported) or greater but mp4 to Android 3 (which is supported).
* Relaxing plugin click-to-play restrictions ({{bug|1186948})}) on some sites to fix Flash plugin detection.
* Temporarily shim APIs that have been removed until top site is updated (e.g. showModalDialog).
